19-55159062-T-C

Position:

chr19-55159062-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PM4BS1_Supporting

The NM_001256715.2(DNAAF3):c.1626A>G(p.Ter542TrpextTer4) variant causes a stop lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000855 in 1,578,778 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00048 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000043 ( 0 hom. )

Consequence

DNAAF3
NM_001256715.2 stop_lost

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 0.200

Variant links:

Genes affected

DNAAF3 (HGNC:30492): (dynein axonemal assembly factor 3) The protein encoded by this gene is required for the assembly of axonemal inner and outer dynein arms and plays a role in assembling dynein complexes for transport into cilia. Defects in this gene are a cause of primary ciliary dyskinesia type 2 (CILD2). Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2012]

DNAAF3 links:

DNAAF3-AS1 (HGNC:55292): (DNAAF3 antisense RNA 1)

DNAAF3-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Stoplost variant in NM_001256715.2 Downstream stopcodon found after 63 codons.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000481 (73/151668) while in subpopulation AFR AF= 0.00155 (64/41346). AF 95% confidence interval is 0.00124. There are 0 homozygotes in gnomad4. There are 43 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
DNAAF3	NM_001256715.2 linkuse as main transcript	c.1626A>G	p.Ter542TrpextTer4	stop_lost	12/12	ENST00000524407.7
DNAAF3	NM_001256714.1 linkuse as main transcript	c.1827A>G	p.Ter609TrpextTer4	stop_lost	12/12
DNAAF3	NM_178837.4 linkuse as main transcript	c.1767A>G	p.Ter589TrpextTer4	stop_lost	12/12
DNAAF3	NM_001256716.2 linkuse as main transcript	c.1464A>G	p.Ter488TrpextTer4	stop_lost	12/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNAAF3	ENST00000524407.7 linkuse as main transcript	c.1626A>G	p.Ter542TrpextTer4	stop_lost	12/12	1	NM_001256715.2	A2	Q8N9W5-1
DNAAF3-AS1	ENST00000591665.1 linkuse as main transcript	n.124T>C		non_coding_transcript_exon_variant	1/5	2

Frequencies

GnomAD3 genomes

AF:

0.000482

AC:

AN:

151548

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00155

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000592

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000137

AC:

AN:

225952

Hom.:

AF XY:

0.000105

AC XY:

AN XY:

123432

show subpopulations

Gnomad AFR exome

AF:

0.00193

Gnomad AMR exome

AF:

0.0000658

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000186

GnomAD4 exome

AF:

0.0000434

AC:

AN:

1427110

Hom.:

Cov.:

AF XY:

0.0000453

AC XY:

AN XY:

706236

show subpopulations

Gnomad4 AFR exome

AF:

0.00161

Gnomad4 AMR exome

AF:

0.0000750

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.000119

GnomAD4 genome

AF:

0.000481

AC:

AN:

151668

Hom.:

Cov.:

AF XY:

0.000580

AC XY:

AN XY:

74100

show subpopulations

Gnomad4 AFR

AF:

0.00155

Gnomad4 AMR

AF:

0.000591

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000258

Hom.:

Bravo

AF:

0.000502

ESP6500AA

AF:

0.00219

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000149

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Primary ciliary dyskinesia 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Dec 31, 2021

- -

Primary ciliary dyskinesia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 14, 2022

This sequence change disrupts the translational stop signal of the DNAAF3 mRNA. It is expected to extend the length of the DNAAF3 protein by 4 additional amino acid residues. This variant is present in population databases (rs199882635, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with DNAAF3-related conditions. ClinVar contains an entry for this variant (Variation ID: 454620). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 24, 2024

Normal stop codon changed to a Tryptophan codon, leading to the addition of 4 amino acids at the C-terminus; Has not been previously published as pathogenic or benign to our knowledge -

DNAAF3-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

May 05, 2023

The DNAAF3 c.1827A>G variant is predicted to result in extension of the open reading frame (p.*609Trpext*4). To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.16% of alleles in individuals of African descent in gnomAD (http://gnomad.broadinstitute.org/variant/19-55670430-T-C). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.75

BayesDel_noAF

Benign

-0.87

CADD

Benign

7.1

DANN

Benign

0.80

Eigen

Benign

0.011

Eigen_PC

Benign

-0.43

FATHMM_MKL

Benign

0.016

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N

Vest4

0.017

GERP RS

-2.0

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over